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 ```Where can one order a copy of EIA RS-222-G? The Electronic Industries Association seems to have evaporated. Then, I checked the ANSI site eStore for this spec with no joy. Not even a reference. Dennis, K6IFB -----Original Message----- >From: Mike >Sent: Feb 18, 2010 11:29 PM >To: "'Tower and HF antenna construction topics.'" >Subject: Re: [TowerTalk] wind load > >WIND LOADING: Engineering analysis indicates the tower will support 23 >square feet of projected area at 85 MPH 3 second gust wind speed per >ANSI/TIA EIA RS >222 Rev. G. > >Does not matter what you think or feel, all that matters to the local city >these days is the example above. > >Mike > >-----Original Message----- > > >Hi Rex et al > >Yeah, but for how long? > >I've always wondered if that is a sustained 70 mph wind for 5 hours or a >gust or 2 at that speed. 73 >Tom W7WHY > > > > >I believe it's saying that at 70MPH, the tower will support 15 sqft of >antenna/mast/whatever is put on it. Most antennas will specify effective >"wind load" in square feet of "projected area." > > -Rex- > > K1HI >Rex Lint > Merrimack, NH > > >I've been looking at various tower specifications, and often see >something like this > >Maximum Wind Load >70 MPH 15 sq. ft. > >I don't really understand how to interpret this. I think a wind load >is a (static) force, and therefore should be measured in either >newtons or pounds. IIUC, it should be proportional to the square of >the wind speed and that the constant of proportionality should itself >be proportional to the cross-sectional area to the wind. So 15 sq ft >is an area, and 70 MPH is a wind speed, but I'm still missing some >factors in order to calculate a force. > >Can anyone shed some light? > >73s > > >_______________________________________________ > > > >_______________________________________________ >TowerTalk mailing list >TowerTalk@contesting.com >http://lists.contesting.com/mailman/listinfo/towertalk >No virus found in this incoming message. >Checked by AVG - www.avg.com >Version: 8.5.435 / Virus Database: 271.1.1/2689 - Release Date: 02/18/10 >19:34:00 > >_______________________________________________ > > > >_______________________________________________ >TowerTalk mailing list >TowerTalk@contesting.com >http://lists.contesting.com/mailman/listinfo/towertalk _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```